INT 31H 0006H: Query Segment Base Address

                                                    Compatibility: DPMI 0.9+ 
 Expects: AX    0006H
          BX    selector
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 Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
          CX:DX 32-bit linear base address of the segment
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    Info: This obtains the 32-bit linear base address of the segment
          identified by the selector in BX.

          Use the LSL opcode to query the limit.

See Also: DPMI API
          INT 2fH: Multiplex Interrupt
          DOS Functions
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